Odb2 not responding to scanners no start diesel plus it only tries to turn over in neutral?

Tiny
JAMES03131982
  • MEMBER
  • 2003 DODGE RAM
  • 5.9L
  • TURBO
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
Not getting my odb2 to respond to scanners. Plus, my cluster is not working, plus it's a no start diesel plus it only tries to turn over in neutral.
Monday, January 30th, 2023 AT 8:02 PM

25 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,331 POSTS
From the description it sounds like the CM either doesn't have power or it is bad. The security module is in the cluster and if it isn't registering the PCM and that the cluster is active you would get the no start condition because the lift pump wouldn't activate.
What was going on prior to this event?
As a start I would grab a test light and run all of the fuses in the boxes.

https://www.2carpros.com/articles/how-to-check-a-car-fuse
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Replace any bad fuses and try again. Also do a good inspection for any damaged wiring.
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+1
Monday, January 30th, 2023 AT 9:02 PM
Tiny
JAMES03131982
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Thanks for the info. So, here is what happened: my motor blew up, so I switched the motor out. The motor ran fine, but it had no power, so I took it to a diesel mechanic he told me it was the lift pump. So, I brought it home and put a new lift pump in it did the same thing. It was a new start, but when I left the mechanics, it was running, then all of a sudden it had no start. Now I've replaced the CP3 three times I put new injectors I put pretty much the whole fuel rail system brand new in. I'm getting about half a gallon of diesel out of my fast to my CP3 in about 5 seconds, but I'm not getting any diesel out of the CP3 to the fuel rail it's just spitting and sputtering.
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Tuesday, January 31st, 2023 AT 8:36 AM
Tiny
JAMES03131982
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And now that I replaced the CP3; my gauges don't move, but my shifter shows what gear I'm going into.
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Tuesday, January 31st, 2023 AT 8:39 AM
Tiny
JAMES03131982
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This is weird, I can plug my scanner into the OBD, and it comes on meaning it's powering my scanner, but it's not scanning anything.
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Tuesday, January 31st, 2023 AT 8:42 AM
Tiny
STEVE W.
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So, it did run but then quit and is a no start. I would really go over the wiring from the engine to the ECM. If you mean you have replaced the engine control module, did you program the replacement so the security system doesn't shut off the main relay?
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Tuesday, January 31st, 2023 AT 8:57 AM
Tiny
JAMES03131982
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No, I replaced the motor itself but when I switch the motor out I put the ECU from the new motor in the new truck should I have not done that.
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Tuesday, January 31st, 2023 AT 9:00 AM
Tiny
JAMES03131982
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The only thing I've replaced since I got it back from the diesel mechanic was pretty much the whole fuel rail system, nothing else.
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Tuesday, January 31st, 2023 AT 9:02 AM
Tiny
STEVE W.
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The ECU needs to be programmed to match the truck; the engines are both the same year, yes? Dodge changed things multiple times in that time period.
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Tuesday, January 31st, 2023 AT 9:08 AM
Tiny
JAMES03131982
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I just put the ECU that was from the truck itself back in still everything is the same I checked all fuses they're none blown.
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Tuesday, January 31st, 2023 AT 9:11 AM
Tiny
JAMES03131982
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I don't know if this matters but the 4-wheel service light stays on meaning it says 4 wheel service under the mileage.
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Tuesday, January 31st, 2023 AT 9:13 AM
Tiny
STEVE W.
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So, it is turning over but it won't start, and you are not seeing fuel at the injectors? Have you tried to bleed the fuel system or is that where you say you are getting just spitting? If that is the case, then you are pulling air into the fuel system somewhere or the injector pump has a problem. You should get a steady stream of fuel.
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Tuesday, January 31st, 2023 AT 9:17 AM
Tiny
JAMES03131982
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So, I'm getting about a half a gallon from the fast system to the CP3, but from the CP3 to the fuel rail it's only spitting out. I've replaced the CP3 three times all the same results. Is there a way to prime the CP3?
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Tuesday, January 31st, 2023 AT 10:27 AM
Tiny
STEVE W.
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The lift pump should prime it. To do that you turn the key on then turn it quickly to start and back to run, that should run the lift pump for about 20 seconds, repeat that a couple times and see if you get fuel from the injector pump.
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Tuesday, January 31st, 2023 AT 12:39 PM
Tiny
JAMES03131982
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Tested all fuses getting light to them even the one wire on the OBD but still nothing.
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Tuesday, January 31st, 2023 AT 2:18 PM
Tiny
STEVE W.
  • MECHANIC
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So, the lift pump isn't turning on when you cycle the key? You are seeing nothing when you connect the scan tool? What year is the engine and its ECU and what part number is on the ECU? Did it come out of an automatic transmission truck? Asking because the 2003 is a unicorn, only the 2003 ECU works with the 2003 engine. 02 is different than 04. The engines are also different when it comes to the sensor outputs. I'm wondering if the issue isn't simply parts mismatch.

ECM, 5.9L (RH rear engine), California emissions, (ID 56040477AA)
ECM, 5.9L (RH rear engine), Federal emissions, ID 56028740AB
ECM, 5.9L (RH rear engine), Federal emissions, ID 56040476AB
ECM, 5.9L (diesel), (mounted to side of engine), AT
ECM, 5.9L (diesel), (mounted to side of engine), MT
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Tuesday, January 31st, 2023 AT 8:10 PM
Tiny
JAMES03131982
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The 03 ECU is back in the o3 everything from the 03 is in the 03 except the motor block.
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Wednesday, February 1st, 2023 AT 6:55 AM
Tiny
STEVE W.
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Okay, what is the engine itself from? Chrysler made many changes in those years as they were changing corporate bosses. Many of their engines ended up changed in a minor way that made them not interchangeable. The most common changes were to the camshaft and crankshaft reluctor wheels. For instance, on the 3.7 they reversed the direction of the notches on the crankshaft from 1-2-3 to 3-2-1 and the cam wheels got more notches. Everything else stayed the same, the engines looked identical and would interchange fine, but they wouldn't run on the same electronics as they had changed suppliers.
I would hope they didn't do the same with the diesels, but the interchange shows that the 2002 engine is different than the 2003 and the 2004 is different again.
Looking at the individual parts isn't encouraging either, the 2003 cam and ECU only list as 2003. So what year is the bare engine you installed? What parts were moved from the original?
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Wednesday, February 1st, 2023 AT 7:21 AM
Tiny
JAMES03131982
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Everything is from a 03 to a 03 it ran before I gave it to the diesel shop then when I picked it up because they told me it was the CP3 it hasn't run since the gages worked and everything until I put 4 different CP3 in it. Now no gauges and it will not start.
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Wednesday, February 1st, 2023 AT 11:25 AM
Tiny
JAMES03131982
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  • 15 POSTS
Here is a video.
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Wednesday, February 1st, 2023 AT 4:03 PM
Tiny
JAMES03131982
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Again suggestions.
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Thursday, February 2nd, 2023 AT 8:01 AM

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